feat: use go1.16 and resources embedding (#235)

* feat: use go1.16 embedding for resources

We want to embed everything that can be easily embedded. We should, at a
minimum, replace the downloading of resources and bindata.

Ref: https://github.com/ooni/probe/issues/1367.

* fix: get rid of bindata and use go embed instead

* fix: start unbreaking some automatic tests

* fix: fetch resources as part of the mobile build

* fix: convert more stuff to go1.16

I still expect many breakages, but we'll fix them.

* fix: make the windows CI green

* fix: get resources before running QA

* fix: go1.16 uses modules by default

* hopefully fix all other outstanding issues

* fix(QA/telegram.py): add another DC IP address

* Apply suggestions from code review

.github/workflows/android.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v1
         with:
-          go-version: "1.14"
+          go-version: "1.16"
       - uses: actions/checkout@v2
       - run: brew install --cask android-sdk
       - run: echo y | sdkmanager --install "platforms;android-29"